body {
    margin: 0;
    padding: 10px;
    box-sizing: border-box;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.chart-container {
    width: 100%;
    height: 100%;
    max-width: 90vw;
    max-height: 90vh;
    position: relative;
}